基于Leach模型的空气耦合超声换能器声阻抗匹配特性研究[ ]

Research on Impedance and Matching Layer Characteristics of Air-Coupled Ultrasonic Transducers

摘要:

针对空气与空气耦合超声换能器之间的声阻抗不匹配，换能器换能效率低的问题，文章利用PSpice仿真工具对空气耦合超声换能器进行建模和仿真，研究换能器经过声阻抗匹配后对换能器性能的改善情况。文章描述了如何使用PSpice建立空气耦合传感器的电路模型，并设置仿真参数。通过仿真阻抗图和时域曲线，与实际测试结果进行了对比和验证。分析了多层匹配层对换能器信号幅值的影响，同时，还验证了经过声阻抗匹配后的换能器在实际中的应用情况。

Abstract:

Addressing the problem of mismatched acoustic impedance between air-coupled ultrasonic transducers, which leads to low transduction efficiency, paper utilizes PSpice simulation tool to model and simulate air-coupled ultrasonic transducers, investigating the performance improvement after impedance matching. The paper describes the process of establishing the circuit model for the air-coupled sensor using PSpice and sets the simulation parameters. A comparison and validation with actual test results are conducted through impedance simulation plots and time-domain curves. The impact of multi-layer matching on the transducer"s signal amplitude is analyzed, and the practical application of the transducer after impedance matching is also verified.